Add `Store::isTrustedClient()`

This function returns true or false depending on whether the Nix client
is trusted or not. Mostly relevant when speaking to a remote store with
a daemon.

We include this information in `nix ping store` and `nix doctor`

Co-Authored-By: John Ericson <John.Ericson@Obsidian.Systems>

1 files changed, 9 insertions, 0 deletions

diff --git a/src/libstore/legacy-ssh-store.cc b/src/libstore/legacy-ssh-store.cc
index 98322b045..eb471d8fc 100644
--- a/src/libstore/legacy-ssh-store.cc
+++ b/src/libstore/legacy-ssh-store.cc
@@ -389,6 +389,15 @@ public:
         return conn->remoteVersion;
     }
 
+    /**
+     * The legacy ssh protocol doesn't support checking for trusted-user.
+     * Try using ssh-ng:// instead if you want to know.
+     */
+    std::optional<TrustedFlag> isTrustedClient() override
+    {
+        return std::nullopt;
+    }
+
     void queryRealisationUncached(const DrvOutput &,
         Callback<std::shared_ptr<const Realisation>> callback) noexcept override
     // TODO: Implement